Grommet Kit: Includes 100pcs grommet eyelets (with 100pcs grommets) and washer individually packed in a PE bag), a punch tool and a fixing tool, all in a non-destructive plastic box. Dimensions: Inner diameter: 12mm (1/2 inch) and outer diameter: 21mm (5/6 inch) High-quality material: The grommet is made of high-quality copper with high corrosion resistance and bright appearance, very difficult to oxidize. Easy to use: The grommet hole kit makes installation easy. First punch the tarpaulin (fabric) into the hole with the punch tool, then remove the grommet set, and finally fix with the included grommet set. Please place a rubber mat or wooden board when punching. avoid blunt punches by the amateur. Versatile Uses: The grommet kit is suitable for canvas, tarpaulin, tent, curtain, backpack, leather craft, repair, decoration. (Materials less than 1mm thick) Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a